During the Quaternary period, spanning the last 2 million years, major glaciations in polar regions affected global sea level, which fell to 120metres below present level, leaving the site of present-day Hong Kong as much as 130 kilometres from the coast.

• 长达200万年的第四纪期间，全球海平面受到两极地区几次大冰期的影响，曾下降至现时海平面之下120米，当时的海岸线离开现时本港海岸达130公里。